/**
 * ReMooz - Zoomer
 *
 * Inspired by so many boxes and zooms
 *
 * @version        1.0
 *
 * @license        MIT-style license
 * @author        Harald Kirschner <mail [at] digitarald.de>
 * @copyright    Author
 */
 
var ReMooz = new Class({

    Implements: [Events, Options, Chain],

    options: {
        link: null,
        type: 'image',
        container: null,
        className: null,
        centered: false,
        dragging: true,
        closeOnClick: true,
        shadow: (Browser.Engine.trident) ? 'onOpenEnd' : 'onOpen', // performance
        resize: true,
        margin: 20,
        resizeFactor: 0.95,
        resizeLimit: false, // {x: 640, y: 640}
        fixedSize: false,
        cutOut: true,
        addClick: true,
        opacityLoad: 0.6,
        opacityResize: 1,
        opacityTitle: 0.9,
        resizeOptions: {},
        fxOptions: {},
        closer: true,
        parse: false, // 'rel'
        parseSecure: false,
        temporary: false,
        onBuild: $empty,
        onLoad: $empty,
        onOpen: $empty,
        onOpenEnd: $empty,
        onClose: $empty,
        onCloseEnd: $empty,
        generateTitle: function(el) {
            var text = el.get('title');
            if (!text) return false;
            var title = text.split(' :: ');
            var head = new Element('h6', {'html': title[0]});
            return (title[1]) ? [head, new Element('p', {'html': title[1]})] : head;
        }
    },

    initialize: function(element, options) {
        this.element = $(element);
        this.setOptions(options);
        if (this.options.parse) {
            var obj = this.element.getProperty(this.options.parse);
            if (obj && (obj = JSON.decode(obj, this.options.parseSecure))) this.setOptions(obj);
        }
        var origin = this.options.origin;
        this.origin = ((origin) ? $(origin) || this.element.getElement(origin) : null) || this.element;
        this.link = this.options.link || this.element.get('href') || this.element.get('src');
        this.container = $(this.options.container) || this.element.getDocument();
        this.bound = {
            'click': function(e) {
                this.open.delay(1, this);
                return false;
            }.bind(this),
            'close': this.close.bind(this),
            'dragClose': function(e) {
                if (e.rightClick) return;
                this.close();
            }.bind(this)
        };
        if (this.options.addClick) this.bindToElement();
    },

    destroy: function() {
        if (this.box) this.box.destroy();
        this.box = this.tweens = this.body = this.content = null;
    },

    bindToElement: function(element) {
        ($(element) || this.element).addClass('remooz-element').addEvent('click', this.bound.click);
        return this;
    },

    getOriginCoordinates: function() {
        var coords = this.origin.getCoordinates();
        delete coords.right;
        delete coords.bottom;
        return coords;
    },

    open: function(e) {
        if (this.opened) return (e) ? this.close() : this;
        this.opened = this.loading = true;
        if (!this.box) this.build();
        this.coords = this.getOriginCoordinates();
        this.coords.opacity = this.options.opacityLoad;
        this.coords.display = '';
        this.tweens.box.set(this.coords);
        this.box.addClass('remooz-loading');
        ReMooz.open(this.fireEvent('onLoad'));
        this['open' + this.options.type.capitalize()]();
        document.addEvent("mousewheel",function(e){ e.preventDefault(); });
        return this;
    },

    finishOpen: function() {
        this.tweens.fade.start(0, 1);
        this.drag.attach();
        this.fireEvent('onOpenEnd').callChain();
    },

    close: function() {
        document.removeEvents("mousewheel");
        if (!this.opened) return this;
        this.opened = false;
        ReMooz.close(this.fireEvent('onClose'));
        if (this.loading) {
            this.box.setStyle('display', 'none');
            return this;
        }
        this.drag.detach();
        this.tweens.fade.cancel().set(0).fireEvent('onComplete');
        if (this.tweens.box.timer) this.tweens.box.clearChain();
        var vars = this.getOriginCoordinates();
        if (this.options.opacityResize != 1) vars.opacity = this.options.opacityResize;
        this.tweens.box.start(vars).chain(this.closeEnd.bind(this));
        return this;
    },

    closeEnd: function() {
        if (this.options.cutOut) this.element.setStyle('visibility', 'visible');
        this.box.setStyle('display', 'none');
        this.fireEvent('onCloseEnd').callChain();
        if (this.options.temporary) this.destroy();
    },

    openImage: function() {
        var tmp = new Image();
        tmp.onload = tmp.onabort = tmp.onerror = function(fast) {
            this.loading = tmp.onload = tmp.onabort = tmp.onerror = null;
            if (!tmp.width || !this.opened) {
                this.fireEvent('onError').close();
                return;
            }
            var to = {x: tmp.width, y: tmp.height};
            if (!this.content) this.content = $(tmp).inject(this.body);
            else tmp = null;
            this[(this.options.resize) ? 'zoomRelativeTo' : 'zoomTo'].create({
                'delay': (tmp && fast !== true) ? 1 : null,
                'arguments': [to],
                'bind': this
            })();
        }.bind(this);
        tmp.src = this.link;
        if (tmp && tmp.complete && tmp.onload) tmp.onload(true);
    },

    /**
     * @todo Test implementation
     */
    openElement: function() {
        this.content = this.content || $(this.link) || $E(this.link);
        if (!this.content) {
            this.fireEvent('onError').close();
            return;
        }
        this.content.inject(this.body);
        this.zoomTo({x: this.content.scrollWidth, y: this.content.scrollHeight});
    },

    zoomRelativeTo: function(to) {
        var scale = this.options.resizeLimit;
        if (!scale) {
            scale = this.container.getSize();
            scale.x *= this.options.resizeFactor;
            scale.y *= this.options.resizeFactor;
        }
        for (var i = 2; i--;) {
            if (to.x > scale.x) {
                to.y *= scale.x / to.x;
                to.x = scale.x;
            } else if (to.y > scale.y) {
                to.x *= scale.y / to.y;
                to.y = scale.y;
            }
        }
        return this.zoomTo({x: to.x.toInt(), y: to.y.toInt()});
    },

    zoomTo: function(to) {
        to = this.options.fixedSize || to;
        var box = this.container.getSize(), scroll = this.container.getScroll();
        var pos = (!this.options.centered) ? {
            x: (this.coords.left + (this.coords.width / 2) - to.x / 2).toInt()
                .limit(scroll.x + this.options.margin, scroll.x + box.x - this.options.margin - to.x),
            y: (this.coords.top + (this.coords.height / 2) - to.y / 2).toInt()
                .limit(scroll.y + this.options.margin, scroll.y + box.y - this.options.margin - to.y)
        } :  {
            x: scroll.x + ((box.x - to.x) / 2).toInt(),
            y: scroll.y + ((box.y - to.y) / 2).toInt()
        };
        if (this.options.cutOut) this.element.setStyle('visibility', 'hidden');
        this.box.removeClass('remooz-loading');
        var vars = {left: pos.x, top: pos.y, width: to.x, height: to.y};
        if (this.options.opacityResize != 1) vars.opacity = [this.options.opacityResize, 1];
        else this.box.set('opacity', 1);
        this.tweens.box.start(vars).chain(this.finishOpen.bind(this));
        this.fireEvent('onOpen');
    },

    build: function() {
        this.addEvent('onBlur', function() {
            this.focused = false;
            this.box.removeClass('remooz-box-focus').setStyle('z-index', ReMooz.options.zIndex);
        }, true);
        this.addEvent('onFocus', function() {
            this.focused = true;
            this.box.addClass('remooz-box-focus').setStyle('z-index', ReMooz.options.zIndexFocus);
        }, true);

        var classes = ['remooz-box', 'remooz-type-' + this.options.type, 'remooz-engine-' + Browser.Engine.name + Browser.Engine.version];
        if (this.options.className) classes.push(this.options.className);
        this.box = new Element('div', {
            'class': classes.join(' '),
            'styles': {
                'display': 'none',
                'top': 0,
                'left': 0,
                'zIndex': ReMooz.options.zIndex
            }
        });

        this.tweens = {
            'box': new Fx.Morph(this.box, $merge({
                    'duration': 400,
                    'unit': 'px',
                    'transition': Fx.Transitions.Quart.easeOut,
                    'chain': 'cancel'
                }, this.options.resizeOptions)
            ),
            'fade': new Fx.Tween(null, $merge({
                    'property': 'opacity',
                    'duration': (Browser.Engine.trident) ? 0 : 300,
                    'chain': 'cancel'
                }, this.options.fxOptions)).addEvents({
                    'onComplete': function() {
                        if (!this.element.get('opacity')) this.element.setStyle('display', 'none');
                    },
                    'onStart': function() {
                        if (!this.element.get('opacity')) this.element.setStyle('display', '');
                    }
                }
            )
        };
        this.tweens.fade.element = $$();

        if (this.options.shadow) {
            if (Browser.Engine.webkit420) {
                this.box.setStyle('-webkit-box-shadow', '0 0 10px rgba(0, 0, 0, 0.7)');
            } else if (!Browser.Engine.trident4) {
                var shadow = new Element('div', {'class': 'remooz-bg-wrap'}).inject(this.box);
                ['n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw'].each(function(dir) {
                    new Element('div', {'class': 'remooz-bg remooz-bg-' + dir}).inject(shadow);
                });
                this.tweens.bg = new Fx.Tween(shadow, {
                    'property': 'opacity',
                    'chain': 'cancel'
                }).set(0);
                this.addEvent(this.options.shadow, this.tweens.bg.set.bind(this.tweens.bg, 1), true);
                this.addEvent('onClose', this.tweens.bg.set.bind(this.tweens.bg, 0), true);
            }
        }

        if (this.options.closer) {
            var closer = new Element('a', {
                'class': 'remooz-btn-close',
                'events': {'click': this.bound.close}
            }).inject(this.box);
            this.tweens.fade.element.push(closer);
        }
        this.body = new Element('div', {'class': 'remooz-body'}).inject(this.box);

        var title = this.options.title || this.options.generateTitle.call(this, this.element);
        if (title) { // thx ie6
            var title = new Element('div', {'class': 'remooz-title'}).adopt(
                new Element('div', {'class': 'remooz-title-bg', 'opacity': this.options.opacityTitle}),
                new Element('div', {'class': 'remooz-title-content'}).adopt(title)
            ).inject(this.box);
            this.tweens.fade.element.push(title);
        }
        this.tweens.fade.set(0).fireEvent('onComplete');

        this.drag = new Drag.Move(this.box, {
            'snap': 15,
            'preventDefault': true,
            'onBeforeStart': function() {
                if (!this.focused && !this.loading) ReMooz.focus(this);
                else if (this.loading || this.options.closeOnClick) this.box.addEvent('mouseup', this.bound.dragClose);
            }.bind(this),
            'onSnap': function() {
                this.box.removeEvent('mouseup', this.bound.dragClose);
                if (!this.options.dragging) this.drag.stop();
                else this.box.addClass('remooz-box-dragging');
            }.bind(this),
            'onComplete': function() {
                this.box.removeClass('remooz-box-dragging');
            }.bind(this)
        });
        this.drag.detach();

        this.fireEvent('onBuild', this.box, this.element);
        this.box.inject(this.element.getDocument().body);
    }

});

ReMooz.factory = function(extended) {
    return $extend(this, extended);
};

ReMooz.factory(new Options).factory({

    options: {
        zIndex: 41,
        zIndexFocus: 42,
        query: 'a.remooz',
        modal: false
    },

    assign: function(elements, options) {
        return $$(elements).map(function(element) {
            return new ReMooz(element, options);
        }, this);
    },

    stack: [],

    open: function(obj) {
        var last = this.stack.getLast();
        this.focus(obj);
        if (last && this.options.modal) last.close();
    },

    close: function(obj) {
        var length = this.stack.length - 1;
        if (length > 1 && this.stack[length] == obj) this.focus(this.stack[length - 1]);
        this.stack.erase(obj);
    },

    focus: function(obj) {
        var last = this.stack.getLast();
        obj.fireEvent('onFocus', [obj]);
        if (last == obj) return;
        if (last) last.fireEvent('onBlur', [last]);
        this.stack.erase(obj).push(obj);
    }

});

window.addEvent('domready', function(){ 
ReMooz.assign('.remooz', {
        'origin': 'img',
        'shadow': 'onOpenEnd', // fx is faster because shadow appears after resize animation
        'resizeFactor': 0.8, // resize to maximum 80% of screen size
        'cutOut': true, // don't hide the original
        'opacityResize': 0.4, // opaque resize
        'dragging': false, // disable dragging
        'centered': true // resize to center of the screen, not relative to the source element
    });

});